Ms. Allen tells us that she had grown up being taught (even at the University of Virginia, “Mr. Jefferson’s University”) that the United States was founded as “a Christian nation.” Much to her surprise, she later encountered many passages in biographies about the Founders that testified to their trust in reason, not revelation, and to their roots in “the Enlightenment,” not in Judaism or Christianity. Her passion now is to tell the world of her discovery. America, she writes, is an Enlightenment nation, not a Christian nation. The “moral minority,” she holds, saw this from the beginning.

My own experience, interestingly enough, was almost precisely the opposite. I grew up as a Roman Catholic — that is, neither mainline Protestant nor evangelical Protestant. When I began to read more widely in the records of the founding I was quite surprised with how saturated with Christian concepts the American “philosophy” is. My Catholic teachers (several key ones educated in Europe) tended to dismiss the American founding as excessively individualistic, materialistic, Masonic, and deist. They did not consider it worthy of holding a significant place in serious Christian reflection.

Slowly, I came to see how thoroughly wrong they were. David Gelernter writes in his brilliant new book, Americanism, of a similar discovery on his own part, from the point of view of Judaism. America, he discovered, is a biblical nation, a biblical republic, and its basic tenets (“We hold these truths”) are matters of faith, not reason, prospective rather than descriptive. While one does not have to hold either Jewish or Christian faith to accept these tenets, sheer honesty compels one to observe how thoroughly biblical they are. Their inner music — what gives their words “resonance” and makes these tenets seem like common sense — is beautifully biblical, and makes the words ring with self-evidence.

Even President Jefferson, the least religiously orthodox of the founders, thought it his duty to attend religious services at the U.S. Capitol building on as many Sundays as he could — at that time, the largest religious service in the country — and even provided the Marine Band at government expense. (Where was the ACLU in those days? They could have stopped the public expression of biblical religion in its infancy. They could have sued Jefferson.) Jefferson’s reasoning was that Christianity (steeped heavily in Judaism) is the best religion a Republic could have, and it was his duty, as Chief Magistrate, to lend it his public support.

Thus, quite the opposite of Ms. Allen, I was surprised by the depth and power of the Christian concepts by which the Founders articulated their reasoning. Their reasoning was not driven by any old common sense, but by a distinctively Jewish and Christian common sense, saturated with Jewish and Christian conceptions of human nature, liberty, historical progress, and the nature of God (Creator, Governor, Judge). No Islamic tradition ever exhibited the same philosophical structure. Neither did the reasoning of the ancient Greeks and Romans, nor that of Kant, Rousseau, Hegel, and other heroes of the “Enlightenment.”

The United States, I concluded, took flight on two wings, and could not have taken flight on one of them alone. The two wings were (and are) humble faith and common sense. By “humble faith” is meant the humbling that brought about the eventual recognition that colonies founded in pursuit for religious liberty were, in America, too often suppressing other sects in their midst — for instance, children of the Pilgrims administering public lashings to Quakers, Protestants in Maryland forbidding Catholics from holding public office, etc. Most Christians began to recognize that such behavior disgraced the religious principles they held. By 1787, they were seeking a far more “Christian” accommodation to religious pluralism, and took as their model, more or less, the Declaration of Religious Liberty in William Penn’s Charter of 1701. (To celebrate, the famed Liberty Bell had been cast.)

Not only that, the Americans pioneered in several new philosophical conceptions essential to their understanding of religious liberty, and profoundly Jewish and Christian in inspiration: concepts such as the self-evident duties that rational creatures owe to their Creator, and subsistence of this Creator as “Spirit and Truth,” who appeals to humans in their inalienable, Creator-given individual freedom. This argument is quite evident in the Virginia Statute for Religious Freedom (1786) and in Madison’s Memorial Remonstrance against Religious Assessments (1785). For more on this subject, one might consult the Epilogue, “How Did the Virginians Ground Religious Rights?” in my On Two Wings: Humble Faith and Common Sense at the American Founding.

Ms. Allen was thus surprised when she encountered recent biographies of Adams, Hamilton, Jefferson, and even Washington that presented these founders as deists, not Christians, formed mostly by the “Enlightenment,” and only superficially by Judaism and Christianity. My own reading of these and other biographies strongly suggested that contemporary historians tend to be relatively uninterested in religion, and are seriously uninformed about its intellectual structure and complexities. For instance, nearly all of them see “deism” where many in the founding period saw “natural theology,” that is, the study of everything that can be known about God through reason alone. Courses in natural theology were mandatory in virtually all the significant colleges and universities of the period.

To me, the most disturbing part of Ms. Allen’s frank and lovely reply lies in its concluding lines, in which she wrote that the point I made about “two wings”

might have been true for two hundred years after the founding of the Republic, but it seems to me that the collaboration has now begun to break down; that with a two-party system in which the wing of biblical faith now adheres almost exclusively to one party and the wing of “common sense” to the other, we have reached not only political but cultural deadlock. We are truly two countries.

I don’t find Ms. Allen’s description fully accurate. A great many Republicans, at least one-third, do not attend church. More than one-third of Democrats are frequent church-goers. In fact, until very recently, the base of the Democratic Party rested upon a broad coalition consisting of the Jews and Catholics of the Northern cities, combined with most of the Bible-belt Christians of the South and West.

It is true that Roe v. Wade (1973) seriously disrupted this coalition, and that such new questions as abortion and same-sex marriage have sundered the traditional accommodation between religious reason and secular reason. But this alone would not divide us into “two countries,” except for one other factor.

In an unprecedented way, secular elites have violated the traditional harmony of the two wings by attempting to cut off the religious wing from any role in public life. The novelty of such aggression, it seems to me, comes almost wholly from the secular side, especially among professors, lawyers, and judges. Its best chance to power is the courts, not the consent of the governed.

Those who have been trying to cut off the religious wing of the American eagle are showing far less wisdom than Tocqueville observed in our forefathers:

Anglo-American civilization … is the product of two perfectly distinct elements which elsewhere have often been at war with one another but which in America it was somehow possible to incorporate into each other, forming a marvelous combination. I mean the spirit of religion and the spirit of freedom… Far from harming each other, these two apparently opposed tendencies work in harmony and seem to lend to each other mutual support.

Religion regards civil liberty as a noble exercise of men’s faculties, the world of politics being a sphere intended by the Creator for the free play of intelligence. Religion, being free and powerful within its own sphere and content with the position reserved for it, realized that its sway is all the better established because it relies only on its own powers and rules men’s hearts without external support.

Freedom sees religion as the companion of its struggles and triumphs, the cradle of its infancy, and the divine source of its rights. Religion is considered as the guardian of mores, and mores are regarded as the guarantee of the laws and pledge for the maintenance of freedom itself.

The unstated intention of my own work is to honor Tocqueville’s principle by reminding religious people of the importance of the wing of reason and common sense, and secular people of the importance of the wing of biblical religion, the primary origin and nourishing mother even of such “Enlightenment ideals” as fraternity, liberty of conscience, and equality. Missing either of these wings, the American eagle cannot fly.